/* Custom styles for AI Test System */

:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f8f9fa;
}

.main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 56px);
}

/* Card styles */
.card {
    border: none;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    margin-bottom: 1.5rem;
}

.card-header {
    background-color: #fff;
    border-bottom: 1px solid rgba(0, 0, 0, 0.125);
    font-weight: 600;
}

/* Table styles */
.table {
    background-color: #fff;
}

.table thead th {
    border-bottom: 2px solid #dee2e6;
    font-weight: 600;
}

/* Button styles */
.btn {
    font-weight: 500;
    padding: 0.5rem 1rem;
}

/* Navbar styles */
.navbar-brand {
    font-weight: 600;
    font-size: 1.25rem;
}

.navbar-dark .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.85);
}

.navbar-dark .navbar-nav .nav-link:hover {
    color: #fff;
}

/* Form styles */
.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

/* Badge styles */
.badge {
    font-weight: 500;
    padding: 0.35em 0.65em;
}

/* Alert styles */
.alert {
    border: none;
    border-left: 4px solid;
}

.alert-success {
    border-left-color: var(--success-color);
}

.alert-danger {
    border-left-color: var(--danger-color);
}

.alert-warning {
    border-left-color: var(--warning-color);
}

.alert-info {
    border-left-color: var(--info-color);
}

/* Loading spinner */
.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

/* Responsive utilities */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem 0;
    }

    .card {
        margin-bottom: 1rem;
    }
}